@Article{icces.2008.007.135,
AUTHOR = {J.  Toribio, V.  Kharin},
TITLE = {On the Validity of the Fracture Mechanics Approach to Hydrogen Assisted Cracking},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {7},
YEAR = {2008},
NUMBER = {3},
PAGES = {135--140},
URL = {http://www.techscience.com/icces/v7n3/32324},
ISSN = {1933-2815},
ABSTRACT = {This paper deals with the meaning and significance of the fracture mechanics
approach to hydrogen assisted cracking, analyzing the question of <i>K</i>-dominance not
only over the purely mechanical aspects, but also over the environmental (physicochemical) events. Two key factors able to violate the uniqueness of the crack
growth kinetics curve <i>v = v(K)</i> are discussed: the role of far field (the stress-strain
field which is not <i>K</i>-dominated) and the effect of the history of hydrogenation and
crack growth. The far field is shown to have a minor effect on near-tip hydrogen diffusion, and thus it can only widen the scatter band of crack growth rates in
the near-threshold portion of the <i>v(K)</i>-curve. With regard to the effect of history,
the study reveals that hydrogenation and crack growth are coupled processes, one
influencing the other, so the crack growth kinetics curve <i>v = v(K)</i> is not unique,
although a special regime of steady-state crack growth is seen to exist in which
hydrogen assisted cracking turns out to be a <i>K</i>-dominated process, and the corresponding plot of the steady-state <i>v</i> against <i>K</i> acquires the uniqueness of a material’s
characteristic curve useful in engineering.},
DOI = {10.3970/icces.2008.007.135}
}